The story follows two 11-year-old girls who are convicted of murdering a baby and are incarcerated until they turn 18 (Fanning, Macdonald). Upon their release, children start to go missing; as the police turn their attention to the duo, the mystery surrounding the original murder comes back to light.

Diane Lane also stars as the mother of one of the girls, portraying a woman who has long known that her daughter is a gifted liar. Elizabeth Banks plays the lead police officer who finds herself emotionally involved in the case.